It seems even stranger in hindsight that in ESB the Rebel base is so small. Vader had to scour the galaxy for them but they had all these Mon Calamari allies from such an early date? I always presumed the largest group they had was in ROTJ.
That’s a little detail I like a lot about the OT. The fact that the Rebellion grows noticably larger with each movie. It’s satisfying to watch the Rebels grow from the small group they’re shown as in ANH, to having a small fleet in ESB, to the impressive fleet we see in RotJ. There’s this sense of progression for the faction that’s shown without being stated outright. Rogue One messes with that. The fact that the Rebel Alliance is able to so quickly muster a large fleet like that so early in the war makes the fleet in RotJ less impactful.